0 a position on a map that has been divided into squares by numbered lines going from one side to the other and from top to bottom so that you can find places easily on it: --
One such mark was a trig point or flagstaff that was left at a grid reference of 783 192.
The grid reference for each reserve relates to the approximate centre of the reserve.
The metric national grid reference system was launched and 1:25000-scale series of maps was introduced.
The convention is the grid reference numbers call out the lower-left corner of the desired square.
Teams are then given a series of grid reference checkpoints which they must navigate to and choose a route between.
Each summit appears only once, with height and grid reference.
The mishap occurred because of a grid reference error of one digit during the foot and mouth outbreak in 2001.
Secondly, the published grid reference was wrong.
